Whetstone

Whetstone's public verifier toolbox as MCP tools. Three tiers. Tier 0 is stateless: you supply the data (exam rows, paired results, documents, event logs) and get back audits, promotion verdicts, patches, or counterexamples; payloads and results are not persisted, while operational counters and standard access logs are retained. Tier 1 is the disposable report card: report_card_start hands your agent a small graph-repair exam minted from the repository's public frontier, report_card_submit grades it by checker spec and requires a verified repair to retain at least 5% of clean support for promotion grade (no answer key exists), then destroys the session. Tier 2 is Open Promotion Bench: open_bench_start gives a paired baseline/candidate scope-integrity cohort, open_bench_submit grades both answer maps, and open_bench_leaderboard returns opt-in public receipts. Published entries retain only the self-attested manifests and sanitized receipts, never tasks or answers. No private exam bank is